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$4 x$
Arrange the rational expression
$\left ( \color{#FF6800}{ - } \color{#FF6800}{ 20 } \color{#FF6800}{ x } \right ) \color{#FF6800}{ \div } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \right )$
$ $ Get rid of unnecessary parentheses $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 20 } \color{#FF6800}{ x } \color{#FF6800}{ \div } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \right )$
$\color{#FF6800}{ - } 20 x \div \left ( \color{#FF6800}{ - } 5 \right )$
$ $ Since negative numbers are multiplied by an even number, remove the (-) sign $ $
$20 x \div 5$
$\color{#FF6800}{ 20 } \color{#FF6800}{ x } \color{#FF6800}{ \div } \color{#FF6800}{ 5 }$
$ $ Calculate the multiplication expression $ $
$\color{#FF6800}{ 4 } \color{#FF6800}{ x }$
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